Be interested in what you mean by "evidence" Paul.........You can go beyond "Eat right for your type" & look at Metabolic Typing. there does seem to be more & more evidence coming out that what we eat can affect our gene expression but that not every individual will necessarily have an identical response to identical foods. I agree we all need to eat "healthily" but there is even confusion around what that means too - and plenty of political interference!!! Sticking to food with as few additives and preservatives, taking control of what we put into our bodies, eating fresh wherever possible & then "listening" to how our body responds to that food has to be the way to go. Thermomix is surely the ideal solution for people who want to take that responsibility on.
BTW I work in the complementary medicine field so I am a little biased!!!